Grout saw



FIG. 1 is a front elevational view of a grout saw showing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a right elevational view;

FIG. 4 is a bottom plan view; and

FIG. 5 is a bottom perspective view, the broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a grout saw, as shown and described. 